By MICHAEL M. GRYNBAUM

March 15, 2017

With a single tweet on Tuesday, Ms. Maddow, the MSNBC anchor, set the political world ablaze, announcing at 7:36 p.m. that she was poised to reveal previously unseen tax records from President Trump on her 9 p.m. program. (“Seriously,” Ms. Maddow added.)

In the need-it-this-instant world of online news, 84 minutes struck some journalists as an awfully long time to wait. The White House took advantage, releasing a pre-emptive statement that detailed Mr. Trump’s tax figures from 2005 before MSNBC had a chance to air its own report. The Daily Beast and other news outlets ran items as well.

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Ms. Maddow, who is enjoying the biggest viewership of her show’s nine-year run, did not appear to mind. She opened her program on Tuesday as she usually does: with a deliberately paced, fact-heavy monologue, in this case reviewing Mr. Trump’s past refusal to release his taxes to catch up viewers on why this new revelation mattered.

The revelation itself, however, was held back until after the first commercial break, a windup that some fellow journalists, eager for any bombshells, found exceedingly lengthy.

Video A 2005 tax return belonging to President Trump was revealed on "The Rachel Maddow Show" on Tuesday.

Stephen Crowley/The New York Times

The wait, about 20 minutes in all, may have irked political reporters, but it was of a piece with the strategy Ms. Maddow has laid out for herself and her staff. In an interview last week, she described “a real sense of responsibility” to educate her 2.6 million-strong audience, particularly those who may be casual consumers of the news.

“There’s new people here every night,” Ms. Maddow said in her NBC office in New York. “I don’t feel like I’m doing a clubhouse update. I don’t feel like I’ve got a choir that was here at last night’s practice too. I definitely feel like, hey, if you’re new, let me meet you where you are.”

Ultimately, the reporting that Ms. Maddow eventually aired on Tuesday night’s show — two pages from a single, decade-old federal tax return — was less groundbreaking than the mere fact that a portion of the president’s records had surfaced at all. The journalist who obtained the records, David Cay Johnston, a former tax reporter for The New York Times, said that the documents arrived “over the transom” in his mailbox. Mr. Johnston even speculated on-air that Mr. Trump had sent the documents himself.

The discussion between Ms. Maddow and Mr. Johnston veered into some odd directions, with Mr. Johnston mentioning a connection between Mr. Trump and the mob. And Ms. Maddow’s opening monologue raised lingering questions about links between Mr. Trump and Russia — questions that no simple 1040 form, like the one sent to Mr. Johnston, could address.

It was not until the end of the program that Ms. Maddow invited on an NBC News political reporter, Hallie Jackson, who dialed in by telephone for a more sober analysis of the tax findings. By then, Ms. Maddow’s show was about to end.

On Twitter, journalists complained that Ms. Maddow had overhyped her findings with the initial teasing tweet, noting that the information in the returns did not amount to a scandal. Others asked why so much of the focus was on Ms. Maddow and not the subject at hand. “The President of the United States has not released his tax returns,” wrote Peter Hamby, a journalist at Snapchat who previously worked for CNN. “Journalists are attacking Maddow for using her show to discuss this.”

Good reviews or bad — scoop or no scoop — Ms. Maddow’s Tuesday program is sure to keep her at the center of the political conversation. Last week, Ms. Maddow achieved a ratings milestone, beating out Fox News heavyweights Bill O’Reilly and Tucker Carlson among viewers aged 25 to 54, the most coveted demographic in television news.

“Never imagined I would want to choose a restaurant based on their willingness to turn on Rachel Maddow’s show,” the Politico reporter Josh Dawsey wrote on Twitter on Tuesday evening. “Yet here we are.”